From c304c9a7efa8751b5bc7526fa95cd5f30aac2b92 Mon Sep 17 00:00:00 2001
From: scaramallion <scaramallion@users.noreply.github.com>
Date: Mon, 19 Oct 2020 01:49:48 +1100
Subject: [PATCH] bpo-41966: Fix pickling pure datetime.time subclasses
 (GH-22731)

---
 Lib/datetime.py                                                | 2 +-
 Lib/test/datetimetester.py                                     | 3 +++
 Misc/ACKS                                                      | 1 +
 .../next/Library/2020-10-17-07-52-53.bpo-41966.gwEQRZ.rst      | 2 ++
 4 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2020-10-17-07-52-53.bpo-41966.gwEQRZ.rst

diff --git a/Lib/datetime.py b/Lib/datetime.py
index ea86bcb8b23..b896b94b0fe 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -1548,7 +1548,7 @@ class time:
         self._tzinfo = tzinfo
 
     def __reduce_ex__(self, protocol):
-        return (time, self._getstate(protocol))
+        return (self.__class__, self._getstate(protocol))
 
     def __reduce__(self):
         return self.__reduce_ex__(2)
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index 8b61c26f9e5..775d3151ae2 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -1781,6 +1781,7 @@ class TestDate(HarmlessMixedComparison, unittest.TestCase):
             green = pickler.dumps(orig, proto)
             derived = unpickler.loads(green)
             self.assertEqual(orig, derived)
+            self.assertTrue(isinstance(derived, SubclassDate))
 
     def test_backdoor_resistance(self):
         # For fast unpickling, the constructor accepts a pickle byte string.
@@ -2308,6 +2309,7 @@ class TestDateTime(TestDate):
             green = pickler.dumps(orig, proto)
             derived = unpickler.loads(green)
             self.assertEqual(orig, derived)
+            self.assertTrue(isinstance(derived, SubclassDatetime))
 
     def test_compat_unpickle(self):
         tests = [
@@ -3357,6 +3359,7 @@ class TestTime(HarmlessMixedComparison, unittest.TestCase):
             green = pickler.dumps(orig, proto)
             derived = unpickler.loads(green)
             self.assertEqual(orig, derived)
+            self.assertTrue(isinstance(derived, SubclassTime))
 
     def test_compat_unpickle(self):
         tests = [
diff --git a/Misc/ACKS b/Misc/ACKS
index 7f4a9bcbc0f..d81d0a25514 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -787,6 +787,7 @@ Meador Inge
 Peter Ingebretson
 Tony Ingraldi
 John Interrante
+Dean Inwood
 Bob Ippolito
 Roger Irwin
 Atsuo Ishimoto
diff --git a/Misc/NEWS.d/next/Library/2020-10-17-07-52-53.bpo-41966.gwEQRZ.rst b/Misc/NEWS.d/next/Library/2020-10-17-07-52-53.bpo-41966.gwEQRZ.rst
new file mode 100644
index 00000000000..0e7fad40077
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-10-17-07-52-53.bpo-41966.gwEQRZ.rst
@@ -0,0 +1,2 @@
+Fix pickling pure Python :class:`datetime.time` subclasses. Patch by Dean
+Inwood.